Directional aerial



Oct 16, 1928. 1,687,746

G. M. WRIGHT v DIRECTIONAL AERIAL Filed April 19. 1921 anu-nl'oz 6, 11. WRIGHT I GEORGE MAUR IoE wRiG'H'rfoF Lennon, ENGLAN Simeo -Teamammogram Patented 0st. 1 6, 19 28.

TION or AMERICA, AooRPonA'rIoN' oF'nELawAnE.

' V DIRECTIONAL AERIAL.

a natidn filed Apri1 .19,- 19 21, Serial No. 462,625, and in'iGreat Britain July 13,19 181 r f c eaanrnn UNDER ran rn'ovrsrous on THE acT or Mamas, 1921, 41 srzinn, 1313.1 7 1 Applications have been filed in Great Brit- Brazil, June 30, 1920; Ceylon, June 2, 1920 1920; New Zealand, June'22, 1920; Norway, December 31, 1919; Portugal, May'18, 1920; PolancL-July 8, 1920; Spain, May 6,1920; Sweden, December 24L, 1919, for this. invention. I

In the case of directional] aerialsof the: frame type earthed at the middle point of,

the base member for the purpose'of minimizing electrostatic interference, it is necessary to use aclosed frame without a condenser, or with an inaccessible condenser at the top,

Y or with a split condenser at the bottom. ,For

general use such arrangements are inconvenient. r j 7 According to this invention I employ in a frame aerial a pair of symmetrical leads which are brought down ertically from the top of the aerial to a condenser ina convenient position for adjustment,,and I provlde preferably in the middle of thetransformer winding an adjustable connexion to earth so that the lattermay be made-at the node'of potential. i

- In orderto ion readily adjustable tothe potentialnode,

contact. V I My invention isillustrated by the a'ccom I prefer to use asplit winding, and between the two portions of this winding to connect an -inductance with an adjustable earthed panying diagram. 123 1 5 6 7 8 is atria-n gular frame aerial and 3 4:, 6 '5 are leads com ing vertically down to a condenser (ZWVhlCh is adjustable for'the purpose of tuning; a and b are the two portions of the transformer Winding which are; respectively coupled to the-coils e and f and are connected together through an inductance c to any point of :'metrically with respect-to oneanother. The" ain, July 18, 1918 Patent No. 124,188; Aus tralia, June 15, 1920; Belgium,July 5, 1920;"

V the direction finder-of the balancing circuit. Cuba, June 1, 1921; Denmark-January 28, r 1920; France, July 1, 1920; Germany, June 3, I y 1920; Italy, June 8, 1920; Japan, June 30,]

V aerial and initstop by'a pair ofjsymmetrical circuit, means" to connect said loopto the j keep the transformer winding symmetrical and to make the earth connex-l.

t-he b ase' of said loopconnected in. series-with .ing an adjustable connectiongto ,groundfro n an ntermedlatepointthereon'and sa ditransi I Having described Lmy invention, 'whatI -5 claim is: 1 r I r *1 I 1. A directional" frame aerial "having an '8 adjustable condenser located in an accessible 5 7 position and connected in series vwith-said 5 leads and having in its base a split winding 1 with an earth "connexion "between the two] portions thereof; 7 7 "2, Thecombination offa p; aerial inla vertical plane,anadjustable,.condenserf-lo 6 5- .cated near the base ot the loop, 'symmets .rical leads connecting said condenser i n. series with the'upper conductor of the loop, and a coil'in "the lowerconductor hav ng an lntermecllate' polnt connected to 1 ground.

. The combination of a loop aerial,-means for connecting said loop to an indicating ground,and a variable condenser located at the 'base'of said loop and'connected infseries c with said loop by symmetrical leads apoint' substantially electrically equidistant from said last-mentioned means andat asa -10f i 'saidloopp V f a, ,The combination of a loop aerial,;means for connecting saidaloop to an indicating circuit, means to connect said loop to the I ground,;a nd a variable condenser located at said loop by'sym'metrical leads'f at a point substantially electrically opposite to said f lastinentioned meansand at the topfof said i j 5, In I radio signalling apparatus,j a loop {9Q aerlalhavlng altransformer'associated there- V lwith, comprising" two substantially, symnietrical primary' sections connected' in series 'with-each other a11'd with'said'aeria1, win f ing interposed between said'se'ctioiisand hav- 1 former comprising'l a; fpair of f substantially symmetrical secondary windings, each con-' P 1 ts? nae 9 sa d Prim y; sane d q condenser located in an accessible. position and connected in series in the top of said loop, the leads to said condenser being sub stantie'l ly symmetric l. .i?

symmet riczil leads connecting said condenser 1n ser es withand'to the top of saidloop, a coil connected in the base of the loop, incl 10 mver'iaqble connection between said cell and GEORGE MAURICE WRIGHT-T 

